单项选择题

Your grandmother____________ to the hospital at once．

A．must send
B．must be sent
C．must to be send
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单项选择题
Mr. Brown has too many meetings to ________.
A．attend
B．take
C．join
单项选择题
Mary decided to study harder ________ enter a good university.
A．so that
B．in order to
C．for
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